WIP: disable test for Elf64_Phdr

Author: gnzlbg

libc-test/build.rs

@@ -2473,6 +2473,10 @@ fn test_linux(target: &str) {
             // FIXME: is this necessary?
             "sighandler_t" => true,
 
+            // FIXME: these types have a p_type member but some header
+            // has a define p_type __p_type macro that breaks their tests:
+            "Elf64_Phdr" | "Elf32_Phdr" => true,
+
             _ => false,
         }
     });